The SYS_LOADABLE REMOVE command removes an entry from the
    system images file SYS$UPDATE:VMS$SYSTEM_IMAGES.IDX. You
    can then process this file using the command procedure
    SYS$UPDATE:VMS$SYSTEM_IMAGES.COM. Processing the file with
    VMS$SYSTEM_IMAGES.COM generates a new system images data file
    that the system uses when it boots.

    If the file SYS$UPDATE:VMS$SYSTEM_IMAGES.IDX does not exist, the
    SYS_LOADABLE REMOVE command creates a new, empty one.